Method of processing a bulkhead sleeve

Abstract

This invention belongs to the field of partition sleeve manufacturing technology, specifically a partition sleeve processing method, comprising the following steps: S1, dividing the surfaces to be processed into critical surfaces and non-critical surfaces according to their degree of influence on the performance of the partition sleeve; S2, performing rough machining and semi-finishing on the critical and non-critical surfaces. After semi-finishing, the finishing allowance reserved for the critical surfaces is 0.8-1mm, and the finishing allowance reserved for the non-critical surfaces is 1.5-4mm; S3, performing non-destructive testing on the critical surfaces, repairing any defects detected until the quality of the critical surfaces meets the requirements; S4, finishing the critical and non-critical surfaces to the design dimensions. This invention reduces the finishing allowance, especially significantly reducing the finishing allowance for the critical surfaces. Most casting defects can be detected in the semi-finishing stage without affecting the finishing progress. After finishing, defects are significantly reduced, leaving only a small number of local defects, improving overall quality controllability and enhancing product quality.

Description

Technical Field

[0001] This invention belongs to the field of partition sleeve production technology, and in particular, a method for processing partition sleeves. Background Technology

[0002] The turbine diaphragm sleeve is made of ZG15CrMoA alloy casting and requires rough machining, semi-finishing, and finishing before it can be put into use. In the traditional machining process, a 5mm finishing allowance is left on each side after semi-finishing. The excessive material thickness covers casting defects (such as sand holes, porosity, slag inclusions, etc.), causing these defects to not be fully exposed. They are only discovered during the later finishing process, requiring machine shutdown and defect elimination and repair welding. This not only affects the delivery cycle and increases production costs but also affects the company's reputation and poses a significant quality risk. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for processing partition sleeves, which shortens the overall manufacturing cycle and reduces quality risks.

[0004] To solve the above problems, the technical solution adopted by the present invention is: a partition sleeve processing method, comprising the following steps:

[0005] S1. Based on the degree of influence on the performance of the partition sleeve, the surfaces to be processed of the partition sleeve are divided into critical surfaces and non-critical surfaces.

[0006] S2. Perform roughing and semi-finishing on critical and non-critical surfaces. After semi-finishing, the finishing allowance for critical surfaces is 0.8-1mm, and the finishing allowance for non-critical surfaces is 1.5-4mm.

[0007] S3. Perform non-destructive testing on the critical surfaces and repair any defects detected until the quality of the critical surfaces meets the requirements.

[0008] S4. Finish the critical and non-critical surfaces to the design dimensions.

[0009] Furthermore, in step S2, during semi-finishing, the critical surfaces are machined first and the presence of defects on the critical surfaces is monitored in real time. Then, the non-critical surfaces are machined. If there are obvious defects on the critical surfaces, the finishing allowance for the non-critical surfaces is 3-4 mm; if there are no obvious defects on the critical surfaces, the finishing allowance for the non-critical surfaces is 1.5-2 mm.

[0010] Furthermore, in step S3, repairing the detected defects includes: removing the defects, grinding, preheating, repairing welding, and post-weld heat treatment.

[0011] Furthermore, during preheating, the inner wall of the pit and the surrounding area of ​​the base material within a range of at least 50 mm are heated to 150-250°C. After preheating, the preheated area is immediately wrapped with an electric heating blanket or insulation cotton for insulation, and the uniformity of the temperature field is monitored in real time using an infrared thermal imager to ensure that there are no low-temperature dead zones.

[0012] Furthermore, the pit after defect removal consists of a spherical bottom pit, a first step, and a second step from bottom to top. The first step and the second step are connected by a first curved surface, and the second step and the surface of the base material are connected by a second curved surface.

[0013] The repair welding process is as follows:

[0014] The welding torch is perpendicular to the surface of the base material and fills the spherical pit in a spiral upward motion. When it is close to the first step, the welding torch swings laterally in a sawtooth pattern until the part below the first step is filled.

[0015] Forced cooling and hammering are applied to the fill layer below the first step;

[0016] The welding torch is used to fill the area in a horizontal zigzag pattern until the portion below the second step is filled.

[0017] Forced cooling and hammering are applied to the fill layer below the second step;

[0018] The welding torch is used to fill the pit in a horizontal, zigzag motion until the entire pit is filled.

[0019] The filling layer in the entire pit is subjected to forced cooling and hammering.

[0020] Furthermore, the width of the first step and the second step is greater than or equal to 5 mm, the vertical distance from the first step to the center of the spherical pit is 3-5 mm, the vertical distance between the first step and the second step is 3-5 mm, the vertical distance between the second step and the surface of the base material is 3-5 mm, and the radius of the spherical pit, the first curved surface and the second curved surface is greater than or equal to 5 mm.

[0021] Furthermore, ultra-low hydrogen R307 welding rods are used, dried at 350-400℃ for 1-2 hours, and stored in a storage container at 100-150℃ for immediate use.

[0022] Further, in step S2, a vertical lathe is used for semi-finishing. The worktable of the vertical lathe is equipped with four slides and multiple support columns. The slides slide in radial direction with the worktable. Each slide is equipped with a positioning block, which is connected to a clamping force application mechanism. A support block is provided on the upper surface of the positioning block. A pressure sensor is provided on the side wall of the support block facing the center of the worktable. A clamping block is provided on the side wall of the pressure sensor facing the center of the worktable. Multiple studs are fixedly provided on the side wall of the clamping block. The studs pass through the support block and are connected to a locking nut. A three-axis accelerometer is provided on the clamping block.

[0023] The partition sleeve is placed horizontally on the support column, and the clamping force application mechanism drives the support block to move radially, so that the clamping block clamps the bottom of the outer circumferential surface of the partition sleeve.

[0024] When performing semi-finishing on critical surfaces, a pressure sensor is used to monitor the clamping force, and a triaxial accelerometer is used to monitor the vibration of the clamping block. Based on the clamping force and the amplitude of vibration changes, it is determined whether the cutting tool has reached the defect location.

[0025] Furthermore, the clamping block includes a fixed block and a movable block. The stud is disposed on the side wall of the fixed block. The side wall of the fixed block facing the center of the worktable is an arc surface coaxial with the worktable. A sliding groove is provided on the arc surface. A slider is disposed in the sliding groove. The slider is fixedly connected to the movable block. The movable block slides with the arc surface. The triaxial accelerometer is mounted on the movable block.

[0026] The beneficial effects of the present invention are: 1. The present invention reduces the finishing allowance, especially the finishing allowance of key surfaces is greatly reduced. Most casting defects can be found in the semi-finishing stage without affecting the finishing progress. After finishing, the defects are significantly reduced, with only a small number of local defects remaining. The overall quality controllability is improved, and the product quality is enhanced.

[0027] 2. The critical surfaces on the diaphragm sleeve typically include the radial steam cover, axial sealing surface, outer circular support surface, and end positioning surface. The surfaces corresponding to these critical surfaces are usually non-critical surfaces, such as the outer circumferential surface corresponding to the radial steam cover, the inner circumferential surface corresponding to the outer circular support surface, the outer circumferential surface corresponding to the axial sealing surface, and the end face or stepped surface corresponding to the end positioning surface. During welding repair, a large amount of concentrated heat input is required, causing localized thermal expansion of the base material. Constrained by the surrounding cold metal, this results in compressive plastic deformation. Upon cooling, the material contracts but is again constrained, leading to irreversible tensile stress and deformation. If the deformation exceeds the machining allowance, the dimensions of the diaphragm sleeve will not meet the standards after finishing. Therefore, this invention reserves sufficient machining allowance on non-critical surfaces to provide insurance against unpredictable welding deformation on critical surfaces. When significant deformation occurs during welding repair on critical surfaces, finishing can remove the deformed portion, and the machining allowance reserved on non-critical surfaces can compensate for the cut-off portion, ensuring the overall dimensional accuracy of the diaphragm sleeve. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating the present invention;

[0029] Figure 2 This is a schematic diagram showing the division of critical and non-critical surfaces on a partition.

[0030] Figure 3 This is a schematic diagram of the pit after the defect was removed;

[0031] Figure 4 This is a schematic diagram of semi-finishing.

[0032] Figure 5 yes Figure 4 Enlarged diagram of part A in the middle;

[0033] Figure 6 yes Figure 5 Schematic diagram of the AA section;

[0034] Reference numerals: 1—Spherical pit; 2—First step; 3—First curved surface; 4—Second step; 5—Main material surface; 6—Second curved surface; 10—Workbench surface; 11—Slide table; 12—Support column; 13—Positioning block; 15—Clamping force application mechanism; 16—Support block; 17—Pressure sensor; 18—Clamping block; 181—Fixed block; 182—Modible block; 183—Slider; 19—Stud; 110—Locking nut; 111—Triaxial accelerometer. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] The partition sleeve processing method of the present invention, such as Figure 1 As shown, it includes the following steps:

[0037] S1. Based on the degree of influence on the performance of the diaphragm sleeve, the surfaces to be machined on the diaphragm sleeve are divided into critical surfaces and non-critical surfaces. Critical surfaces are typically those that mate with other components, such as radial sealing surfaces, axial sealing surfaces, outer cylindrical support surfaces, and end positioning surfaces. Figure 2 As shown, the radial sealing surface is the bottom surface of the channel located on the inner wall of the diaphragm sleeve, used to install the diaphragm; the axial sealing surface is the end face of the diaphragm sleeve, which contacts the adjacent cylinder or diaphragm; the outer circular support surface is located on the outer wall of the diaphragm sleeve, cooperates with the cylinder, and is used to support the entire diaphragm sleeve; the end positioning surface determines the axial position of the diaphragm sleeve in the cylinder, prevents the diaphragm sleeve from moving axially, and is located on the stepped surface of the outer circle.

[0038] S2. Roughing and semi-finishing are performed on critical and non-critical surfaces. After semi-finishing, the finishing allowance for critical surfaces is 0.8-1mm, and the finishing allowance for non-critical surfaces is 1.5-4mm. By reducing the finishing allowance, especially significantly reducing the finishing allowance for critical surfaces, most casting defects can be detected in the semi-finishing stage, allowing for timely defect handling. After finishing, defects are significantly reduced, leaving only a small number of local defects that do not affect the finishing progress. Overall quality controllability is improved, and product quality is enhanced.

[0039] S3. Perform non-destructive testing on critical surfaces and repair any defects found until the quality of the critical surfaces meets the requirements. Repairing detected defects includes: removing the defects, grinding, preheating, welding repair, and post-weld heat treatment. During preheating, heat the inner wall of the pit and the base material area within a radius of at least 50mm to 150-250℃. After preheating, immediately wrap the preheated area with an electric heating blanket or insulation cotton, and use an infrared thermal imager to monitor the uniformity of the temperature field in real time to ensure there are no low-temperature dead zones, reduce the temperature difference during the welding process, and help reduce welding stress and deformation.

[0040] S4. Finish the critical and non-critical surfaces to the design dimensions.

[0041] During repair welding, a large, concentrated heat input is required, causing localized thermal expansion of the base material. Constrained by the surrounding cold metal, this results in compressive plastic deformation. Upon cooling, the material contracts but is again constrained, leading to irreversible tensile stress and deformation. If the deformation exceeds the machining allowance, the dimensions of the finished partition sleeve will not meet specifications. Furthermore, deformation of critical surfaces can also cause deformation of adjacent non-critical surfaces. For example... Figure 2As shown, the outer circumferential surface corresponding to the radial steam cover, the inner circumferential surface corresponding to the outer circular support surface, the outer circumferential surface corresponding to the axial sealing surface, and the end face or stepped surface corresponding to the end positioning surface are usually non-critical surfaces. This invention reserves sufficient machining allowance on non-critical surfaces to provide insurance for unpredictable welding deformation of critical surfaces. When the deformation is large during the repair welding of critical surfaces, the deformed part can be removed by precision machining, and the machining allowance reserved on non-critical surfaces can be used to compensate for the part cut off from the critical surfaces, ensuring the dimensional accuracy of the entire partition sleeve.

[0042] This invention can prioritize the machining quality of critical surfaces, thereby ensuring the overall performance of the partition sleeve. If casting defects occur during the finishing of non-critical surfaces, a lower standard repair method can be used to reduce deformation.

[0043] When critical surfaces have obvious defects, non-critical surfaces need to retain more finishing allowance to ensure final dimensional accuracy. When critical surfaces do not have obvious defects but are visible, the finishing allowance of non-critical surfaces can be reduced to decrease the amount of finishing work and improve finishing efficiency. To flexibly determine the finishing allowance of non-critical surfaces during semi-finishing, in step S2 of this invention, during semi-finishing, the critical surfaces are machined first, and the presence of defects on the critical surfaces is monitored in real time. Then, the non-critical surfaces are machined. If the critical surfaces have obvious defects, the finishing allowance reserved for the non-critical surfaces is 3-4 mm; if the critical surfaces do not have obvious defects, the finishing allowance reserved for the non-critical surfaces is 1.5-2 mm.

[0044] By monitoring the critical surfaces in real time, we can initially determine whether there are any defects. When defects are present, we can retain more finishing allowance on the non-critical surfaces during the finishing process. If there are no defects, we can reduce the finishing allowance on the non-critical surfaces. This can improve the finishing efficiency of the non-critical surfaces and also help to detect any casting defects that may exist on the non-critical surfaces in a timely manner.

[0045] The pit after defect removal can be a conventional spherical pit, trapezoidal pit, etc. To improve the quality of the repair weld and reduce deformation, the pit after defect removal is arranged from bottom to top as a spherical bottom pit 1, a first step 2, and a second step 4. The first step 2 and the second step 4 are connected by a first curved surface 3, and the second step 4 and the base material surface 5 are connected by a second curved surface 6. Specifically, the width of the first step 2 and the second step 4 is greater than or equal to 5mm, the vertical distance from the first step 2 to the center of the spherical bottom pit 1 is 3-5mm, the vertical distance between the first step 2 and the second step 4 is 3-5mm, the vertical distance from the second step 4 to the base material surface 5 is 3-5mm, and the radius of the spherical bottom pit 1, the first curved surface 3, and the second curved surface 6 is greater than or equal to 5mm.

[0046] The spherical pit 1 is spherical, replacing the traditional flat or pointed bottom. The spherical surface provides optimal stress distribution and a uniform deposition space for subsequent weld overlay. A two-tiered design provides a clear positioning and height reference plane for visual observation during the welding process, accurately controlling the thickness of each weld layer. Curved transitions exist between the second tier 4 and the base material surface 5, as well as between the first tier 2 and the second tier 4, eliminating stress concentration points.

[0047] When removing defects, multiple milling cutters can be used to cut in sequence to form a spherical pit 1, a first step 2, a first curved surface 3, a second step 4, and a second curved surface 6.

[0048] The repair welding process is as follows:

[0049] The welding torch is held perpendicular to the base material surface and fills the spherical pit 1 in a spiral upward motion. When the filling reaches approximately the first step 2, specifically when the distance from the filler layer surface to the first step is about 2 mm, the welding torch performs a transverse zigzag oscillation to continue filling until the portion below the first step 2 is completely filled. This filling method ensures the uniformity of the welding material filling.

[0050] Forced cooling and hammering are applied to the filling layer below the first step 2;

[0051] The welding torch is used to fill the area in a horizontal sawtooth pattern until the portion below the second step 4 is filled.

[0052] Forced cooling and hammering are applied to the filling layer below the second step 4;

[0053] The welding torch is used to fill the pit in a horizontal, zigzag motion until the entire pit is filled.

[0054] The filling layer in the entire pit is subjected to forced cooling and hammering.

[0055] Forced cooling is performed immediately after each weld layer is completed. Forced cooling rapidly reduces the weld temperature to a predetermined target value, preventing excessively high interpass temperatures, reducing the size of the heat-affected zone, and avoiding excessive grain growth in the weld metal and HAZ. Forced cooling can be achieved through compressed air cooling.

[0056] After welding solidifies and cools, strong tensile residual stress is generated at the center of the weld, which can lead to cold cracking and stress corrosion. By hammering the weld layer, the weld metal is stretched and undergoes plastic deformation. This deformation partially offsets the internal shrinkage strain, thereby significantly reducing longitudinal and transverse tensile stresses in the weld. It can even generate beneficial compressive stress on the surface to correct the weld deformation.

[0057] During welding, use ultra-low hydrogen type R307 welding rods, dry them at 350-400℃ for 1-2 hours, and store them in a storage container at 100-150℃. Use them as needed to ensure welding quality.

[0058] Currently, there are various methods for detecting casting defects, such as inducing eddy currents on the workpiece surface using an alternating magnetic field, where defects disturb the eddy currents, causing changes in the impedance or voltage of the detection coil; acquiring workpiece surface images using high-resolution industrial cameras and multi-angle light sources; ultrasonic testing; and industrial CT scanning. Step S3 can use the above methods to directly perform non-destructive testing on the critical surfaces, but monitoring for casting defects on the critical surfaces during semi-finishing requires integrating the aforementioned testing equipment into the machine tool, which is quite difficult to implement.

[0059] To facilitate monitoring for defects on the machined surface, a vertical lathe is used for semi-finishing in step S2. The partition sleeve is a large, disc-shaped part, typically machined using a vertical lathe. For example... Figures 4 to 6 As shown, the worktable 10 of the vertical lathe is provided with four slides 11 and multiple support columns 12. The slides 11 slide in a radial direction with the worktable 10, and the radial position of each slide 11 can be adjusted. Each slide 11 is provided with a positioning block 13. A support block 16 is provided on the upper surface of the positioning block 13. A pressure sensor 17 is provided on the side wall of the support block 16 facing the center of the worktable 10. A clamping block 18 is provided on the side wall of the pressure sensor 17 facing the center of the worktable 10. Multiple studs 19 are fixedly provided on the side wall of the clamping block 18. The studs 19 pass through the support block 16 and are connected to a locking nut 110. A triaxial acceleration sensor 111 is provided on the clamping block 18.

[0060] The positioning block 13 is connected to a clamping force applying mechanism 15, which provides radial thrust, enabling the clamping blocks 18 on the positioning block 13 to clamp the outer circle of the partition sleeve. The clamping force applying mechanism 15 can be a hydraulic cylinder or similar device, mounted on the worktable 10 and connected to the slide 11. It directly pushes the slide 11 radially and provides clamping force, while the positioning block 13 is fixed to the slide 11. Alternatively, the positioning block 13 can slide against the slide 11. The clamping force applying mechanism 15 can be an adjusting bolt, threadedly engaged with the positioning block 13, and rotatably mounted on the slide 11. By rotating the adjusting bolt, the positioning block 13 can be moved, and the slide 11 can be locked and fixed to the worktable 10 by positioning screws.

[0061] The pressure sensor 17 can detect the pressure between the clamping block 18 and the support block 16. After the clamping block 18 is installed on the support block 16, the pressure sensor 17 detects the initial installation pressure between the support block 16 and the clamping block 18. When the clamping block 18 clamps the partition sleeve, the pressure sensor 17 can detect the clamping force of the clamping block 18 on the partition sleeve.

[0062] During clamping, the partition sleeve is placed horizontally on each support column 12, with the support column 12 supporting the bottom surface of the partition sleeve. After the partition sleeve is adjusted to be coaxial with the worktable surface 10, the clamping force application mechanism 15 drives the positioning block 13 and the support block 16 on the positioning block 13 and the clamping block 18 to move radially as a whole, so that the clamping block 18 clamps the bottom of the outer circumferential surface of the partition sleeve.

[0063] When performing semi-finishing on critical surfaces, pressure sensor 17 is used to monitor clamping force, and triaxial accelerometer 111 is used to monitor the vibration of clamping block 18. Based on the clamping force and the amplitude of vibration change, it is determined whether the cutting tool has reached the defect position.

[0064] When the machined surface is free of defects, the cutting tool can cut stably, and the cutting force and the vibration of the diaphragm sleeve remain stable. When the machined surface has casting defects, the cutting force changes significantly the instant the tool reaches the defect. For example, when the tool encounters a pore or sand hole, the cutting edge instantly loses material support, and the cutting force drops sharply. When the tool cuts out of the defect and re-cuts into healthy material, the cutting force rises sharply again. The entire process is completed within milliseconds. When encountering cracks or hard spots, the cutting force first rises sharply and then drops sharply. In addition, defects can cause significant abnormal vibrations in the cutting tool and the diaphragm sleeve.

[0065] In this invention, the clamping force of the clamping blocks 18 on the four slides 11 on the partition sleeve is detected by the pressure sensor 17. In an ideal rigid system, the clamping force is constant. However, in reality, the workpiece, fixture, and cutting tool form an elastic system. When the cutting force changes, this system will produce slight elastic deformation, changing the load distribution of each clamping block 18, that is, the clamping force changes. The pressure sensor 17 can detect this change. When the partition sleeve is clamped but not yet turned, the clamping forces of each clamping block 18 are balanced, and the system is in static equilibrium. During cutting, the cutting force of the cutting tool acts on the workpiece. In order to resist the cutting force, the workpiece has a slight tendency to displacement or rotation. This tendency causes the contact pressure and micro-gap between the workpiece and each clamping block 18 to change. The pressure at some clamping points will increase (sharing part of the cutting force), while the pressure at others will decrease (even showing a tendency for momentary micro-separation). When the cutting surface of the partition sleeve is free of defects, the material is uniform and intact, and the cutting force remains stable. As the depth of cut and tool feed change, the clamping force exhibits stable, periodic, and minute fluctuations, with the fluctuation frequency consistent with the dominant frequency of the cutting force. The signals at each clamping point change in a regular and coordinated manner. When the tool encounters a defect, if the cutting force decreases suddenly, the previously clamped partition sleeve tends to spring back; if the cutting force increases suddenly, the partition sleeve tends to further shift or rotate. Both of these will cause abrupt changes in the clamping force of each clamping block 18. Therefore, based on the detection results of each pressure sensor 17, it is possible to preliminarily determine whether the tool has encountered a defect.

[0066] Meanwhile, when the cutting tool encounters a defect, it will cause the partition sleeve to vibrate irregularly, breaking the original stable vibration amplitude and frequency. The vibration of the partition sleeve will be transmitted to the clamping block 18. Therefore, the vibration frequency and vibration amplitude of the clamping block 18 are detected by the triaxial acceleration sensor 111. When the vibration frequency and vibration amplitude of the clamping block 18 suddenly change significantly, it indicates that the cutting tool has encountered a welding defect.

[0067] If pressure sensor 17 detects a sudden change in pressure value at the same time as a sudden change in the vibration frequency and amplitude of clamping block 18, it can be considered that the cutting tool has encountered a welding defect. If, during the turning process of a certain critical surface, the detection values ​​of pressure sensor 17 and triaxial accelerometer 111 do not change abruptly, it is considered that there is no defect on that critical surface.

[0068] The vibration amplitude of the partition sleeve is relatively small, therefore the vibration amplitude of the clamping block 18 is also relatively small. To more clearly detect abnormal vibrations, the clamping block 18 of this invention includes a fixed block 181 and a movable block 182. A stud 19 is disposed on the side wall of the fixed block 181. The side wall of the fixed block 181 facing the center of the worktable 10 is an arc surface coaxial with the worktable 10. A groove is provided on the arc surface, and a slider 183 is disposed in the groove. The slider 183 can slide in the groove, and the slider 183 can slide back and forth a distance of about 2mm. The slider 183 is fixedly connected to the movable block 182. When the slider 183 slides, it can drive the movable block 182 to move synchronously. The movable block 182 slides in cooperation with the arc surface, and a triaxial acceleration sensor 111 is mounted on the movable block 182.

[0069] During clamping, slider 183 is positioned in the middle of the slide groove, meaning it can slide approximately 1mm in both directions along the groove. Elastic shims can be placed in the slide grooves at both ends of slider 183 to ensure it remains in the middle of the groove when not clamped. After movable block 182 clamps the partition sleeve, turning begins. During normal turning, the partition sleeve vibrates minimally, and movable block 182 remains stationary relative to fixed block 181. When the cutting tool encounters a defect, it instantly generates a high-frequency, high-amplitude cutting force impact pulse. The impact pulse force mainly includes radial (depth of cut) and tangential (cutting speed) components. This impact pulse is transmitted to the movable block 182 in the form of a stress wave, and the tangential component of the impact pulse generates an instantaneous tangential thrust on the movable block 182. This tangential thrust overcomes the system resistance and inertia, driving the movable block 182 to perform a rapid back-and-forth jittering motion, thereby generating a clear vibration signal. The jittering amplitude is usually between tens of micrometers and hundreds of micrometers. The triaxial accelerometer 111 can accurately detect this jittering.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of processing a bulkhead sleeve, characterized by, Includes the following steps: S1. Based on the degree of influence on the performance of the diaphragm sleeve, the surfaces to be processed of the diaphragm sleeve are divided into critical surfaces and non-critical surfaces. The critical surfaces are the radial steam surface, the axial sealing surface, the outer circular support surface, and the end positioning surface. The non-critical surfaces are the outer circumferential surface corresponding to the radial steam surface, the inner circumferential surface corresponding to the outer circular support surface, the outer circumferential surface corresponding to the axial sealing surface, and the end face or stepped surface corresponding to the end positioning surface. S2. Perform roughing and semi-finishing on critical and non-critical surfaces. After semi-finishing, the finishing allowance for critical surfaces is 0.8-1mm, and the finishing allowance for non-critical surfaces is 1.5-4mm. During semi-finishing, the critical surfaces are machined first, and the presence of defects on the critical surfaces is monitored in real time. Then, the non-critical surfaces are machined. If there are obvious defects on the critical surfaces, the finishing allowance for the non-critical surfaces is 3-4mm; if there are no obvious defects on the critical surfaces, the finishing allowance for the non-critical surfaces is 1.5-2mm. S3. Perform non-destructive testing on the critical surfaces and repair any defects detected until the quality of the critical surfaces meets the requirements. Repairing detected defects includes: removing defects, grinding, preheating, welding repair, and post-weld heat treatment; After the defects are removed, the pits are arranged from bottom to top as a spherical bottom pit (1), a first step (2) and a second step (4). The first step (2) and the second step (4) are connected by a first curved surface (3), and the second step (4) and the surface of the base material (5) are connected by a second curved surface (6). The repair welding process is as follows: The welding torch is perpendicular to the surface of the base material and fills the spherical pit (1) in a spiral upward motion. When it is filled to near the first step (2), the welding torch swings in a horizontal sawtooth shape to fill until the part below the first step (2) is filled. Forced cooling and hammering are applied to the filling layer below the first step (2); The welding torch performs a horizontal sawtooth-shaped oscillation to fill the area until the portion below the second step (4) is filled. Forced cooling and hammering are applied to the filling layer below the second step (4); The welding torch is used to fill the pit in a horizontal, zigzag motion until the entire pit is filled. The filling layer in the entire pit is subjected to forced cooling and hammering; S4. Finish the critical and non-critical surfaces to the design dimensions.

2. The method of gasketing according to claim 1, wherein, During preheating, heat the inner wall of the pit and the surrounding area of ​​the base material within a range of at least 50mm to 150-250℃. After preheating, immediately wrap the preheated area with an electric heating blanket or insulation cotton, and use an infrared thermal imager to monitor the uniformity of the temperature field in real time to ensure that there are no low-temperature dead zones.

3. The method for processing a partition sleeve as described in claim 1, characterized in that, The width of the first step (2) and the second step (4) is greater than or equal to 5 mm. The vertical distance from the first step (2) to the center of the spherical pit (1) is 3-5 mm. The vertical distance between the first step (2) and the second step (4) is 3-5 mm. The vertical distance between the second step (4) and the surface of the base material (5) is 3-5 mm. The radius of the spherical pit (1), the first curved surface (3), and the second curved surface (6) is greater than or equal to 5 mm.

4. The method for processing a partition sleeve as described in claim 1, characterized in that, Use ultra-low hydrogen R307 welding rods, dry them at 350-400℃ for 1-2 hours, and store them in a storage container at 100-150℃ for immediate use.

5. The method for processing a partition sleeve as described in claim 1, characterized in that, In step S2, a vertical lathe is used for semi-finishing. The worktable (10) of the vertical lathe is provided with four slides (11) and multiple support columns (12). The slides (11) slide in radial direction with the worktable (10). Each slide (11) is provided with a positioning block (13), and the positioning block (13) is connected to a clamping force application mechanism (15). A support block (16) is provided on the upper surface of the positioning block (13). A pressure sensor (17) is provided on the side wall of the support block (16) facing the center of the worktable (10). A clamping block (18) is provided on the side wall of the pressure sensor (17) facing the center of the worktable (10). Multiple studs (19) are fixedly provided on the side wall of the clamping block (18). The studs (19) pass through the support block (16) and are connected to a locking nut (110). A triaxial acceleration sensor (111) is provided on the clamping block (18). The partition sleeve is placed horizontally on the support column (12), and the clamping force application mechanism (15) drives the support block (16) to move radially, so that the clamping block (18) clamps the bottom of the outer circumferential surface of the partition sleeve. When performing semi-finishing on the critical surface, the clamping force is monitored by a pressure sensor (17), and the vibration of the clamping block (18) is monitored by a triaxial acceleration sensor (111). Based on the clamping force and the amplitude of vibration change, it is determined whether the cutting tool has reached the defect position.

6. The method for processing a partition sleeve as described in claim 5, characterized in that, The clamping block (18) includes a fixed block (181) and a movable block (182). The stud (19) is disposed on the side wall of the fixed block (181). The side wall of the fixed block (181) facing the center of the worktable (10) is an arc surface coaxial with the worktable (10). A sliding groove is provided on the arc surface. A slider (183) is provided in the sliding groove. The slider (183) is fixedly connected to the movable block (182). The movable block (182) slides with the arc surface. The triaxial acceleration sensor (111) is mounted on the movable block (182).

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